Yamaha DGX 500 sustain pedal circuitry does not work

This is not a problem with the pedal, which has been tested and is working. It's an interior problem. Does anyone have
any suggestions about obtaining a circuit diagram and replacement parts? Thanks very much.

Sustain pedal went from intermittent to not working at all. Replaced the pedal, the new one does the same thing. Suspect the jack in the back of the piano is bad, need to hear from others with the same problem.

Sustain pedal went from intermittent to not working at all. Replaced the pedal, the new one does the same thing. Suspect the jack in the back of the piano is bad, need to hear from others with the same problem.

2 Suggested Answers

Hi,
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Hi, I had the same problem, but I have an easy solution. I am trying to connect an FC5 to a Casio CTK-3000. The problem is open vs closed circuit in the pedal and the way that the casio interprets the info. Paulll's fix is correct, but you do not have to use soldering. Simply remove the cover, unscrew the silver screw, and you will notice that the black contraption that holds the two metal strips has one side that pops off. Pop off this side.
Now, notice that the short strip is on top and the long strip is on the bottom. The way the strips bend mean that the circuit is closed when there is no pressure on the pedal. When you press the pedal, the white knob on the long strip pushes the long strip down and breaks the connection with the short strip.
What you need to do now is remove the two strips and slide them back into the black contraption with the long strip on top and the short strip on the bottom. The white knob on the long strip should be facing up. Make sure when you do this that you hook the short strip over that little horizontal black plastic rod so that it will easily contact the long strip when the long strip is pressed down.
By bending the top (long) strip a little, you can make it so that the long strip does not touch the bottom (short) strip in the relaxed position. Make sure that the ends of the strips where the wires join do not touch each other either. You now have an open circuit in the relaxed position, which is what Casio recognizes as NO PEDAL.
Pop the side piece back on the black contraption and screw the black contraption back in place with the silver screw. Set the spring back in place and reattach the 'pedal'. Make sure that there is enough clearance between the top of the white knob and the inside of the pedal so that the circuit remains open in the relaxed position.
Now, if the two strips are NOT touching each other, when you plug it into your Casio, the Casio will not recognize the pedal, which is good. When you push on the pedal, you will close the circuit and the Casio will recognize the pedal.
If you push on the pedal and nothing happens, then the two strips are not contacting each other in the fully pressed position. Take the unit apart and try again.
If the Casio still recognizes the pedal even though you are not pushing on it, then the two strips are contacting each other at any place along their length. Take the unit apart and try again.
Enjoy your new working pedal!
Greg
PS. If you Casio won't work with your computer, there is a fix out there for that too. It involves removing (or renaming) some files that Logitech loads on to your computer when you install a webcam. Weird, but true.

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Your pedal may be the wrong polarity for this keyboard. Different manufacturers wire differently. And some use trs 1/4" and others use ts 1/4". Contact Yamaha customer service to get the correct pedal for your instrument.

Buy sustain pedal made for CASIO or switable model.
Pedal for Yamaha or Roland will work in reverse on a Casio.
If you cannot return for exchange, then open up and solder a different type of micro switch.

This is confusing... you say "the sustain works when you disconnect the cord"? How can that happen? and doesn't work when it is plugged in.

MOST sustain pedal problems are due to people using a different pedal than the keyboard is designed to use. It is very common that someone tries to use a Roland sustain pedal on a Yamaha and oof course it doesn't work because the Roland pedal is normally closed and Yamaha usually requires a normally open contact.

A FEW keyboards now check the state of the pedal input when power is first turned on and configure the pedal polarity accordingly. For these keyboards, make sure the pedal is plugged in before power is turned on.

These footswitches DO go bad and require servicing (east to work on) either cable breaks someplace due to vibration and flexure or the contacts get dirty inside... simple to disassemble and clean.

The other thing is polarity. I know you said it isn't polarity, however should you be holding or not holding it down and the power glitches, the keyboard may read a NEW polarity. Often the power can be very "dirty" at venues. Also sometimes the power cord connector can become marginal causing momentary power loss... USUALLY you would notice this happening.

The function setting is for the PANEL sustain (Page 68 of your manual)

The other method of sustain is by footswitch or pedal option. See page 13.

If you use a footswitch, it needs to be a normally open contact type. If you plug a Roland type in, it is opposite polarity and will sustain UNLESS the pedal is pressed. Make sure nothing else is plugged in the sustain jack... headphones that are inadvertently plugged in there would sustain.

The Yamaha FC-3 uses a TRS (three conductor plug). The PX330 does NOT use TRS jacks for the sustain and sostenuto pedals so they are NOT compatible with the Yamaha FC-3. Therefore I would conclude that continous sustain that the Yamaha pedal would be used for is NOT supported.

I found that if I plug in the sustain pedal BEFORE turning the power on, it works fine. If I plug in the sustain pedal AFTER turning the power on, then it works in the opposite way. Probably just the design. So I would try playing with that before doing anything drastic.